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Definition df-domain 24408
Description: Define the domain function. See brdomain 24472 for its value. (Contributed by Scott Fenton, 11-Apr-2014.)
Assertion
Ref Expression
df-domain  |- Domain  = Image ( 1st  |`  ( _V  X.  _V ) )

Detailed syntax breakdown of Definition df-domain
StepHypRef Expression
1 cdomain 24386 . 2  class Domain
2 c1st 6120 . . . 4  class  1st
3 cvv 2788 . . . . 5  class  _V
43, 3cxp 4687 . . . 4  class  ( _V 
X.  _V )
52, 4cres 4691 . . 3  class  ( 1st  |`  ( _V  X.  _V ) )
65cimage 24383 . 2  class Image ( 1st  |`  ( _V  X.  _V ) )
71, 6wceq 1623 1  wff Domain  = Image ( 1st  |`  ( _V  X.  _V ) )
Colors of variables: wff set class
This definition is referenced by:  brdomain  24472
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